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Electron Transport Chain: Complex III and IV

Electron Transport Chain: Complex III and IV

During the electron transport chain, electrons from NADH and FADH2 are first transferred to complexes I and II, respectively. These two complexes then transfer the electrons to ubiquinol, which carries them further to complex III. Complex III passes the electrons across the intermembrane space to Cyt c, which carries them further to complex IV. Complex IV donates electrons to oxygen and reduces it to water. As electrons pass through complexes I, III, and IV, the energy released aids the pumping...

Electron Transport Chain: Complex I and II

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The mitochondrial electron transport chain (ETC) is the main energy generation system in the eukaryotic cells. However, mitochondria also produce cytotoxic reactive oxygen species (ROS) due to the large electron flow during oxidative phosphorylation. While Complex I is one of the primary sources of superoxide radicals, ROS production by Complex II is uncommon and may only be observed in cancer cells with mutated complexes.
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Redox Reactions

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Redox reactions are vital biochemical processes that underpin energy metabolism in cells. These reactions involve the transfer of electrons between molecules, occurring in tandem as oxidation and reduction. Oxidation refers to the loss of electrons, while reduction denotes their gain. This coupling ensures the seamless flow of electrons through metabolic pathways. For example, in bacterial metabolism, glucose undergoes oxidation to carbon dioxide, while oxygen is simultaneously reduced to...

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Related Experiment Video

Updated: May 17, 2026

Protein Film Infrared Electrochemistry Demonstrated for Study of H2 Oxidation by a [NiFe] Hydrogenase

Protein Film Infrared Electrochemistry Demonstrated for Study of H₂ Oxidation by a [NiFe] Hydrogenase

Published on: December 4, 2017

Human cytochrome b5 reductase: structure, function, and potential applications.

Fatemeh Elahian¹, Zargham Sepehrizadeh, Bahareh Moghimi

¹Department of Pharmaceutical Biotechnology, School of Pharmacy, Zanjan University of Medical Sciences , Iran and.

Critical Reviews in Biotechnology

|November 2, 2012

Summary

This summary is machine-generated.

Cytochrome b5 reductase, a key flavoprotein, exists in two isoforms and is vital for redox reactions like methemoglobin reduction. Its deficiency causes congenital methemoglobinemia.

Keywords:

FAD domain FNR family NADH domain RCM heterologous expression mechanism of action phylogenetics purification

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Last Updated: May 17, 2026

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Published on: December 4, 2017

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Simultaneous Measurement of Superoxide/Hydrogen Peroxide and NADH Production by Flavin-containing Mitochondrial Dehydrogenases

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Published on: February 24, 2018

Area of Science:

Biochemistry
Molecular Biology

Background:

Cytochrome b5 reductase (Cb5R) is a flavoprotein with two isoforms: microsomal and soluble.
These isoforms differ in localization and structure, with the microsomal form anchored to membranes and the soluble form truncated.

Purpose of the Study:

To provide a comprehensive overview of cytochrome b5 reductase structure and function.
To explore potential applications of Cb5R in various industries.

Main Methods:

Review of existing literature on cytochrome b5 reductase.
Analysis of structural and functional data from different eukaryotic sources.

Main Results:

Cb5R facilitates electron transfer from NADH to cytochrome b5 via its FAD domain.
Deficiency in Cb5R leads to methemoglobinemia due to impaired methemoglobin reduction.
The enzyme plays a role in diverse oxidation-reduction reactions.

Conclusions:

Cytochrome b5 reductase is crucial for maintaining hemoglobin function and overall cellular redox balance.
Potential applications exist for Cb5R in the food industry, biosensors, and diagnostics.